... your choices and we are able to develop new models and offer OEM service.For all usb flash drive, the guarantee is 1 year ... very hot to used with the mini speaker;3, Capacity:16mb, 32mb, 64mb, 128mb, 256mb, 512mb, 1gb,2gb,4gb, 8gb, 16gb, 32gb, 64gb ... ;4, Data transfer speed: Read:12mb-25mb/s, Write:3mb-12mb/s;5, Drive support ...